<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.box{
			width: 400px;
			height: 600px;
			border: 1px solid red;
		}
		.top{
			width: 380px;
			height: 200px;
			border: 1px solid red;
			margin: 10px auto;
		}
		.bottom{
			width: 380px;
			height: 376px;
			border: 1px solid red;
			margin: 0 auto;
		}
		.left{
			width: 180px;
			height: 376px;
			border: 1px solid red;
			float: left;
		}
		.right{
			width: 180px;
			height: 376px;
			border: 1px solid red;
			float: right;
		}

	</style>
</head>
<body>
	<div class="box">
		<div class="top"></div>
		<div class="bottom">
			<div class="left"></div>
			<div class="right"></div>
		</div>
	</div>
</body>
</html>